A device which transforms electrical energy into mechanical energy is a _________
a. magnet b. transformer c. generator d. motor
d
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Lenz's law arises because of the following basic principle:
A. Gauss's law B. the conservation of momentum C. Coulomb’s law D. the conservation of energy E. the conservation of charge
When astronomers first saw the spectrum of a quasar they did not recognize it because
a) the lines were so far shifted towards the red b) its spectral signature was masked by the presence of the central supermassive black hole c) the chemical elements present in a quasar were unfamiliar d) the lines were so far shifted towards the blue e) it was too faint to produce spectral lines of any sort
What is the formula of a compound formed from the ions M3+ and X2-?
a. M2X b. MX c. M2X3 d. MX2
The fact that a particle cannot be precisely localized is the
a. photoelectric effect b. uncertainty principle c. principle of a hologram d. principle of a laser e. reason why photons are emitted